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  • Committer: Bazaar Package Importer
  • Author(s): David Paleino
  • Date: 2010-06-12 08:37:34 UTC
  • Revision ID: james.westby@ubuntu.com-20100612083734-1y8kp6qm4sjk60az
Tags: upstream-4.0.1
Import upstream version 4.0.1

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httpcore/src/examples/org/apache/http/examples/ElementalReverseProxy.java
 
1
/*
 
2
 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/examples/org/apache/http/examples/ElementalHttpServer.java $
 
3
 * $Revision: 702589 $
 
4
 * $Date: 2008-10-07 21:13:28 +0200 (Tue, 07 Oct 2008) $
 
5
 *
 
6
 * ====================================================================
 
7
 * Licensed to the Apache Software Foundation (ASF) under one
 
8
 * or more contributor license agreements.  See the NOTICE file
 
9
 * distributed with this work for additional information
 
10
 * regarding copyright ownership.  The ASF licenses this file
 
11
 * to you under the Apache License, Version 2.0 (the
 
12
 * "License"); you may not use this file except in compliance
 
13
 * with the License.  You may obtain a copy of the License at
 
14
 *
 
15
 *   http://www.apache.org/licenses/LICENSE-2.0
 
16
 *
 
17
 * Unless required by applicable law or agreed to in writing,
 
18
 * software distributed under the License is distributed on an
 
19
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 
20
 * KIND, either express or implied.  See the License for the
 
21
 * specific language governing permissions and limitations
 
22
 * under the License.
 
23
 * ====================================================================
 
24
 *
 
25
 * This software consists of voluntary contributions made by many
 
26
 * individuals on behalf of the Apache Software Foundation.  For more
 
27
 * information on the Apache Software Foundation, please see
 
28
 * <http://www.apache.org/>.
 
29
 *
 
30
 */
 
31
 
 
32
package org.apache.http.examples;
 
33
 
 
34
import java.io.IOException;
 
35
import java.io.InterruptedIOException;
 
36
import java.net.ServerSocket;
 
37
import java.net.Socket;
 
38
 
 
39
import org.apache.http.ConnectionClosedException;
 
40
import org.apache.http.ConnectionReuseStrategy;
 
41
import org.apache.http.HttpClientConnection;
 
42
import org.apache.http.HttpException;
 
43
import org.apache.http.HttpHost;
 
44
import org.apache.http.HttpRequest;
 
45
import org.apache.http.HttpResponse;
 
46
import org.apache.http.HttpServerConnection;
 
47
import org.apache.http.impl.DefaultConnectionReuseStrategy;
 
48
import org.apache.http.impl.DefaultHttpClientConnection;
 
49
import org.apache.http.impl.DefaultHttpResponseFactory;
 
50
import org.apache.http.impl.DefaultHttpServerConnection;
 
51
import org.apache.http.params.BasicHttpParams;
 
52
import org.apache.http.params.CoreConnectionPNames;
 
53
import org.apache.http.params.CoreProtocolPNames;
 
54
import org.apache.http.params.HttpParams;
 
55
import org.apache.http.protocol.BasicHttpContext;
 
56
import org.apache.http.protocol.BasicHttpProcessor;
 
57
import org.apache.http.protocol.ExecutionContext;
 
58
import org.apache.http.protocol.HTTP;
 
59
import org.apache.http.protocol.HttpContext;
 
60
import org.apache.http.protocol.HttpProcessor;
 
61
import org.apache.http.protocol.HttpRequestExecutor;
 
62
import org.apache.http.protocol.HttpRequestHandler;
 
63
import org.apache.http.protocol.HttpRequestHandlerRegistry;
 
64
import org.apache.http.protocol.HttpService;
 
65
import org.apache.http.protocol.RequestConnControl;
 
66
import org.apache.http.protocol.RequestContent;
 
67
import org.apache.http.protocol.RequestExpectContinue;
 
68
import org.apache.http.protocol.RequestTargetHost;
 
69
import org.apache.http.protocol.RequestUserAgent;
 
70
import org.apache.http.protocol.ResponseConnControl;
 
71
import org.apache.http.protocol.ResponseContent;
 
72
import org.apache.http.protocol.ResponseDate;
 
73
import org.apache.http.protocol.ResponseServer;
 
74
 
 
75
/**
 
76
 * Rudimentary HTTP/1.1 reverse proxy.
 
77
 * <p>
 
78
 * Please note the purpose of this application is demonstrate the usage of HttpCore APIs.
 
79
 * It is NOT intended to demonstrate the most efficient way of building an HTTP reverse proxy. 
 
80
 * 
 
81
 *
 
82
 * @version $Revision: $
 
83
 */
 
84
public class ElementalReverseProxy {
 
85
 
 
86
    private static final String HTTP_IN_CONN = "http.proxy.in-conn";
 
87
    private static final String HTTP_OUT_CONN = "http.proxy.out-conn";
 
88
    private static final String HTTP_CONN_KEEPALIVE = "http.proxy.conn-keepalive";
 
89
    
 
90
    public static void main(String[] args) throws Exception {
 
91
        if (args.length < 1) {
 
92
            System.err.println("Please specified target hostname and port");
 
93
            System.exit(1);
 
94
        }
 
95
        String hostname = args[0];
 
96
        int port = 80;
 
97
        if (args.length > 1) {
 
98
            port = Integer.parseInt(args[1]);
 
99
        }
 
100
        HttpHost target = new HttpHost(hostname, port);
 
101
        
 
102
        Thread t = new RequestListenerThread(8888, target);
 
103
        t.setDaemon(false);
 
104
        t.start();
 
105
    }
 
106
    
 
107
    static class ProxyHandler implements HttpRequestHandler  {
 
108
        
 
109
        private final HttpHost target;
 
110
        private final HttpProcessor httpproc;
 
111
        private final HttpRequestExecutor httpexecutor;
 
112
        private final ConnectionReuseStrategy connStrategy;
 
113
        
 
114
        public ProxyHandler(
 
115
                final HttpHost target,
 
116
                final HttpProcessor httpproc,
 
117
                final HttpRequestExecutor httpexecutor) {
 
118
            super();
 
119
            this.target = target;
 
120
            this.httpproc = httpproc;
 
121
            this.httpexecutor = httpexecutor;
 
122
            this.connStrategy = new DefaultConnectionReuseStrategy();
 
123
        }
 
124
        
 
125
        public void handle(
 
126
                final HttpRequest request, 
 
127
                final HttpResponse response,
 
128
                final HttpContext context) throws HttpException, IOException {
 
129
            
 
130
            HttpClientConnection conn = (HttpClientConnection) context.getAttribute(
 
131
                    HTTP_OUT_CONN);
 
132
 
 
133
            context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn);
 
134
            context.setAttribute(ExecutionContext.HTTP_TARGET_HOST, this.target);
 
135
 
 
136
            System.out.println(">> Request URI: " + request.getRequestLine().getUri());
 
137
 
 
138
            // Remove hop-by-hop headers
 
139
            request.removeHeaders(HTTP.CONTENT_LEN);
 
140
            request.removeHeaders(HTTP.TRANSFER_ENCODING);
 
141
            request.removeHeaders(HTTP.CONN_DIRECTIVE);
 
142
            request.removeHeaders("Keep-Alive");
 
143
            request.removeHeaders("Proxy-Authenticate");
 
144
            request.removeHeaders("TE");
 
145
            request.removeHeaders("Trailers");
 
146
            request.removeHeaders("Upgrade");
 
147
            
 
148
            this.httpexecutor.preProcess(request, this.httpproc, context);
 
149
            HttpResponse targetResponse = this.httpexecutor.execute(request, conn, context);
 
150
            this.httpexecutor.postProcess(response, this.httpproc, context);
 
151
            
 
152
            // Remove hop-by-hop headers
 
153
            targetResponse.removeHeaders(HTTP.CONTENT_LEN);
 
154
            targetResponse.removeHeaders(HTTP.TRANSFER_ENCODING);
 
155
            targetResponse.removeHeaders(HTTP.CONN_DIRECTIVE);
 
156
            targetResponse.removeHeaders("Keep-Alive");
 
157
            targetResponse.removeHeaders("TE");
 
158
            targetResponse.removeHeaders("Trailers");
 
159
            targetResponse.removeHeaders("Upgrade");
 
160
            
 
161
            response.setStatusLine(targetResponse.getStatusLine());
 
162
            response.setHeaders(targetResponse.getAllHeaders());
 
163
            response.setEntity(targetResponse.getEntity());
 
164
            
 
165
            System.out.println("<< Response: " + response.getStatusLine());
 
166
 
 
167
            boolean keepalive = this.connStrategy.keepAlive(response, context);
 
168
            context.setAttribute(HTTP_CONN_KEEPALIVE, new Boolean(keepalive));
 
169
        }
 
170
        
 
171
    }
 
172
    
 
173
    static class RequestListenerThread extends Thread {
 
174
 
 
175
        private final HttpHost target;
 
176
        private final ServerSocket serversocket;
 
177
        private final HttpParams params; 
 
178
        private final HttpService httpService;
 
179
        
 
180
        public RequestListenerThread(int port, final HttpHost target) throws IOException {
 
181
            this.target = target;
 
182
            this.serversocket = new ServerSocket(port);
 
183
            this.params = new BasicHttpParams();
 
184
            this.params
 
185
                .setIntParameter(CoreConnectionPNames.SO_TIMEOUT, 5000)
 
186
                .setIntParameter(CoreConnectionPNames.SOCKET_BUFFER_SIZE, 8 * 1024)
 
187
                .setBooleanParameter(CoreConnectionPNames.STALE_CONNECTION_CHECK, false)
 
188
                .setBooleanParameter(CoreConnectionPNames.TCP_NODELAY, true)
 
189
                .setParameter(CoreProtocolPNames.ORIGIN_SERVER, "HttpComponents/1.1");
 
190
 
 
191
            // Set up HTTP protocol processor for incoming connections
 
192
            BasicHttpProcessor inhttpproc = new BasicHttpProcessor();
 
193
            inhttpproc.addInterceptor(new ResponseDate());
 
194
            inhttpproc.addInterceptor(new ResponseServer());
 
195
            inhttpproc.addInterceptor(new ResponseContent());
 
196
            inhttpproc.addInterceptor(new ResponseConnControl());
 
197
 
 
198
            // Set up HTTP protocol processor for outgoing connections
 
199
            BasicHttpProcessor outhttpproc = new BasicHttpProcessor();
 
200
            outhttpproc.addInterceptor(new RequestContent());
 
201
            outhttpproc.addInterceptor(new RequestTargetHost());
 
202
            outhttpproc.addInterceptor(new RequestConnControl());
 
203
            outhttpproc.addInterceptor(new RequestUserAgent());
 
204
            outhttpproc.addInterceptor(new RequestExpectContinue());
 
205
 
 
206
            // Set up outgoing request executor 
 
207
            HttpRequestExecutor httpexecutor = new HttpRequestExecutor();
 
208
            
 
209
            // Set up incoming request handler
 
210
            HttpRequestHandlerRegistry reqistry = new HttpRequestHandlerRegistry();
 
211
            reqistry.register("*", new ProxyHandler(
 
212
                    this.target, 
 
213
                    outhttpproc, 
 
214
                    httpexecutor));
 
215
            
 
216
            // Set up the HTTP service
 
217
            this.httpService = new HttpService(
 
218
                    inhttpproc, 
 
219
                    new DefaultConnectionReuseStrategy(), 
 
220
                    new DefaultHttpResponseFactory());
 
221
            this.httpService.setParams(this.params);
 
222
            this.httpService.setHandlerResolver(reqistry);
 
223
        }
 
224
        
 
225
        public void run() {
 
226
            System.out.println("Listening on port " + this.serversocket.getLocalPort());
 
227
            while (!Thread.interrupted()) {
 
228
                try {
 
229
                    // Set up incoming HTTP connection
 
230
                    Socket insocket = this.serversocket.accept();
 
231
                    DefaultHttpServerConnection inconn = new DefaultHttpServerConnection();
 
232
                    System.out.println("Incoming connection from " + insocket.getInetAddress());
 
233
                    inconn.bind(insocket, this.params);
 
234
 
 
235
                    // Set up outgoing HTTP connection
 
236
                    Socket outsocket = new Socket(this.target.getHostName(), this.target.getPort());
 
237
                    DefaultHttpClientConnection outconn = new DefaultHttpClientConnection();
 
238
                    outconn.bind(outsocket, this.params);
 
239
                    System.out.println("Outgoing connection to " + outsocket.getInetAddress());
 
240
                    
 
241
                    // Start worker thread
 
242
                    Thread t = new ProxyThread(this.httpService, inconn, outconn);
 
243
                    t.setDaemon(true);
 
244
                    t.start();
 
245
                } catch (InterruptedIOException ex) {
 
246
                    break;
 
247
                } catch (IOException e) {
 
248
                    System.err.println("I/O error initialising connection thread: " 
 
249
                            + e.getMessage());
 
250
                    break;
 
251
                }
 
252
            }
 
253
        }
 
254
    }
 
255
    
 
256
    static class ProxyThread extends Thread {
 
257
 
 
258
        private final HttpService httpservice;
 
259
        private final HttpServerConnection inconn;
 
260
        private final HttpClientConnection outconn;
 
261
        
 
262
        public ProxyThread(
 
263
                final HttpService httpservice, 
 
264
                final HttpServerConnection inconn,
 
265
                final HttpClientConnection outconn) {
 
266
            super();
 
267
            this.httpservice = httpservice;
 
268
            this.inconn = inconn;
 
269
            this.outconn = outconn;
 
270
        }
 
271
        
 
272
        public void run() {
 
273
            System.out.println("New connection thread");
 
274
            HttpContext context = new BasicHttpContext(null);
 
275
            
 
276
            // Bind connection objects to the execution context
 
277
            context.setAttribute(HTTP_IN_CONN, this.inconn);
 
278
            context.setAttribute(HTTP_OUT_CONN, this.outconn);
 
279
            
 
280
            try {
 
281
                while (!Thread.interrupted()) {
 
282
                    if (!this.inconn.isOpen()) {
 
283
                        this.outconn.close();
 
284
                        break;
 
285
                    }
 
286
                    
 
287
                    this.httpservice.handleRequest(this.inconn, context);
 
288
                    
 
289
                    Boolean keepalive = (Boolean) context.getAttribute(HTTP_CONN_KEEPALIVE);
 
290
                    if (!Boolean.TRUE.equals(keepalive)) {
 
291
                        this.outconn.close();
 
292
                        this.inconn.close();
 
293
                        break;
 
294
                    }
 
295
                }
 
296
            } catch (ConnectionClosedException ex) {
 
297
                System.err.println("Client closed connection");
 
298
            } catch (IOException ex) {
 
299
                System.err.println("I/O error: " + ex.getMessage());
 
300
            } catch (HttpException ex) {
 
301
                System.err.println("Unrecoverable HTTP protocol violation: " + ex.getMessage());
 
302
            } finally {
 
303
                try {
 
304
                    this.inconn.shutdown();
 
305
                } catch (IOException ignore) {}
 
306
                try {
 
307
                    this.outconn.shutdown();
 
308
                } catch (IOException ignore) {}
 
309
            }
 
310
        }
 
311
 
 
312
    }
 
313
    
 
314
}